Superheater.



UNITED STATFS PATENT orrron.

FRANCIS J. COLE, OF NEW YORK, AND CARL J. MELLIN, OF SGHENEC- TADY, NEW YORK, ASSIGNORS TO AMERICAN LOCOMOTIVE COM- PANY, OF NEW YORK, N. 11, A CORPORATION OF NEW YORK.

'SUPERHEATERQ Specification of Letters Patent. Patented Sept, 11, 1906.

Application filed Iircli 26, 1906. Serial No. 307,986-

To all whom it may concern.-

Be it known that; we, FRANCIS J. Core, of the borough of Manhattan, in the city of N ew York, and. CARL J. ZiiELLIN, of Schenectady, in the county of Schenectady, State of New York, have invented a certain new and use- 4 ful improvement in Steam-Boiler superheaters, of which improvement the following is a specification.

Our invention relates to superheaters of the general class or type in which the superheater-pipes are located in fire-tubes of a steam-boiler; .and its object is to provide means for connecting the rear ends of the superheateripes, which will facilitate the cleaning of tlie pipes and superheating-tubes and measurably prevent the accumulation of hard deposit on the ends of the former.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawin Figure 1 is a longitudinal central section t ough aportion of one of the superheating-tubes of a locomotive boiler and through a portion of a header to which the superheater-pipes are connected; Fig. 2, a transverse section on the line .a a of Fig. 1; Fig. 3, a vertical longitudinal central section, on an enlarged scale,

through one of the return-bends; and Fig. 4, a

rear view in elevation of the same.

Our invention is herein exemplified as applied in a superheater of the character of that set forth in Letters Patent of the Um'ted States .\'o.- 782,490, granted and issued to the American Locomotive Company, as our assignee, under date of February 14, 1905, there being, as in the construction of said Letters Patent, a plurality of superheaterpipes 69', extending longitudinally n pairs or m U form, in each of a setof superheatingtubes 67, which are of lar er diameter than the ordinary fire-tubes o the boiler. The superheater-pipes which form steam-channe s directly exposed throughout their length to the heat of the superheating-tubes, are connected at their forward ends to headers 70 of suitable construction which are located in advance of the front flue-sheet or flue-head i and which as they do not form part of our )resent invention need not be herein at en th described. The rear ends of the suer eater-pipes of each air or U are con- .ected byreturn-bends, t ose, 69 of the up- .lower side, so as to per pairs of pipes in the superheater-tubes,

WhlCll are located in advance of those of the 3 curved or segmental return-bends 69, having threaded nozzles 69 projecting from the lower ends of their front sides for the attachment' of the superheater-pipes .69. The bodies of the returmbends 69 arefiattened on their lower sides at and adjacent to their front ends and are upwardly tapered or inclined for the remainder of their length to a narrow edge at their rear ends, their lower surfaces being thereby made substantially semiconical or half-funnel shaped, as clearly indicated in Figs. 3 and 4.. Lateral feet or projections 69, the faces of which are curved correspondingly with the inner surfaces of the superheating-tubes 67, are formed on the lower portions of the return-bends 69', said feet or projections abutting against the inner surfaces of the superheating-tubes and supporting and firmly holding the rear ends of the superheater-pipes at a desired and determined level therein.

By the employment of return-bends of the construction above described for the connection of the rear ends of superheater-pipes we attain the substantial advantages in practice of reducing the resistance to the passage of the products of combustion through the superheating-tubes, facilitating the cleaning of said tubes and the superheater-pipes, and con siderably reducing the formation of a hard deposit upon the return-bends and pipes, which has been found to occur in the use of connections of the ordinary construction.

We claim as our invention and desire to secure by Letters Patent 1. In a steam-boiler superheater, 11 segmental return-bend connection for the rear ends of superheater-pipes which is upwardly and rearwardly tapered or inclined on its resent thereon a sub- 'stantially semiconica or half-funnel face to products of combustion passing around it.

2. In a steam-boiler superheater, a returnbend connection for the rear ends of superheaterpipes, which is of transversely curyed or segmental form, providedwith longitudinal nozzles on its front for the attachment of superlieater-pipes, and upwardly and rearwardly tapered or inclined on its lower side, so as to present thereon a substantially semiconical or half-funnel surface.

3 In a steam-boiler superheater, a returnbend connection for the rear ends of superheater-pipes, which is of transverselycurved or segmental form, provided with longitudinal nozzles on its front for the attachment of superheater-pipes, upwardly and rearwardly tapered or inclined on its lower side, and provided with lateral feet or projections curved to abut against a superheating-tube.

4. In a steam-boiler superheater, the com- 'bination of a superheating-tube, two superheater-pipes extending longitudinally therein, and a transversely-curved or segmental return-bend attached to the rear ends of the superheater-pipes and having its lower side upwardly and rearwardly tapered or inclined so as to present thereon a substantially semi- Witnesses as to F. J. Cole: CHAS. H. APPS, G. H. WEILER.

VVit-nesses as to C. J. Mellin: YV. W. MCMINX,

L. A HAYNE. 

